Bovine lactoferrin protects RSC96 Schwann cells from tumor necrosis factor-α–induced growth arrest via extracellular-signal-regulated kinase 1/2

Neuroscience ◽  
2008 ◽  
Vol 151 (2) ◽  
pp. 396-402 ◽  
Author(s):  
T.-Y. Lin ◽  
C.-D. Kuo
Keyword(s):  
Tumor Necrosis Factor ◽  
Schwann Cells ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Growth Arrest ◽  
Bovine Lactoferrin ◽  
Extracellular Signal Regulated Kinase ◽  
Extracellular Signal ◽  
Factor Α ◽  
Necrosis Factor

scholarly journals Extracellular Signal-regulated Kinase Phosphorylates Tumor Necrosis Factor α-converting Enzyme at Threonine 735: A Potential Role in Regulated Shedding

2002 ◽  
Vol 13 (6) ◽  
pp. 2031-2044 ◽  
Author(s):  
Elena Dı́az-Rodrı́guez ◽  
Juan Carlos Montero ◽  
Azucena Esparı́s-Ogando ◽  
Laura Yuste ◽  
Atanasio Pandiella
Keyword(s):  
Tumor Necrosis Factor ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Converting Enzyme ◽  
Erk Activation ◽  
Extracellular Signal Regulated Kinase ◽  
Extracellular Signal ◽  
Mitogen Activated Protein ◽  
Factor Α ◽  
Necrosis Factor

The ectodomain of certain transmembrane proteins can be released by the action of cell surface proteases, termed secretases. Here we have investigated how mitogen-activated protein kinases (MAPKs) control the shedding of membrane proteins. We show that extracellular signal-regulated kinase (Erk) acts as an intermediate in protein kinase C-regulated TrkA cleavage. We report that the cytosolic tail of the tumor necrosis factor α-converting enzyme (TACE) is phosphorylated by Erk at threonine 735. In addition, we show that Erk and TACE associate. This association is favored by Erk activation and by the presence of threonine 735. In contrast to the Erk route, the p38 MAPK was able to stimulate TrkA cleavage in cells devoid of TACE activity, indicating that other proteases are also involved in TrkA shedding. These results demonstrate that secretases are able to discriminate between the different stimuli that trigger membrane protein ectodomain cleavage and indicate that phosphorylation by MAPKs may regulate the proteolytic function of membrane secretases.

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